Add support for persisting CompositionUnderlines in InputMethodController

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 5270a9126081f9e6297c41fe033c08ba781b95e6..47a32fc621b0c423ebd815234c11848c1d48b7ed 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -4234,7 +4234,7 @@ void Document::didInsertText(Node* text, unsigned offset, unsigned length) {
   for (Range* range : m_ranges)
     range->didInsertText(text, offset, length);
 
-  m_markers->shiftMarkers(text, offset, length);
+  m_markers->shiftMarkers(text, offset, 0, length);
 }
 
 void Document::didRemoveText(Node* text, unsigned offset, unsigned length) {
@@ -4242,7 +4242,7 @@ void Document::didRemoveText(Node* text, unsigned offset, unsigned length) {
     range->didRemoveText(text, offset, length);
 
   m_markers->removeMarkers(text, offset, length);
-  m_markers->shiftMarkers(text, offset + length, 0 - length);
+  m_markers->shiftMarkers(text, offset, length, 0);
 }
 
 void Document::didMergeTextNodes(Text& oldNode, unsigned offset) {